Mitsubishi Montero Sport (2004+). Manual — part 240

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-373

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is lower than approx-

imately 100

°C (212°F) when the engine is

started.

• Intake air temperature is lower than 60°C (140°F)

when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or more.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be higher

than +7.4 percent for 5 seconds.

K

LRN

: LONG-TERM TRIM

K

I

: SHORT-TERM TRIM

K0 : MAXIMUM LIMIT OF LONG-TERM TRIM
K1 : MAXIMUM LIMIT OF SHORT-TERM TRIM
K2 : MINIMUM LIMIT OF LONG-TERM TRIM
K3 : MINIMUM LIMIT OF SHORT-TERM TRIM

START

MONITORING

CONDITIONS

END

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

K

LRN

> K0

MALFUNCTION

GOOD

K

LRN

< K2

K

I

< K3

K

I

> K1

CONTINUOUS FAILURE

FOR 5secs

AK204050

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-374

Check Conditions

• Engine coolant temperature is lower than approx-

imately 100

°C (212°F) when the engine is

started.

• Intake air temperature is lower than 60°C (140°F)

when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or less.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

or

• Short-term fuel trim has continued to be higher

than +12.5 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than

approximately 100

°C (212°F) when the engine is

started.

• Intake air temperature is higher than 60°C

(140

°F) when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or more.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent or 5 seconds.

or

• Short-term fuel trim has continued to be higher

than +17.6 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than

approximately 100

°C (212°F) when the engine is

started.

• Intake air temperature is higher than 60°C

(140

°F) when the engine is started.

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or less.

Judgment Criteria

• Long-term fuel trim has continued to be higher

than +12.5 percent or 5 seconds.

or

• Short-term fuel trim has continued to be higher

than +22.3 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 77°C

(171

°F).

• Under the closed loop air/fuel ratio control.

Judgment Criteria

• Long-term fuel trim has continued to be +12.5

percent for 5 seconds.

or

• Short-term fuel trim has continued to be +25 per-

cent for 5 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 2

− Fuel Trim Monitor

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set are:)

• Volume airflow sensor failed.

• Injector (Number 1, 3, 5) failed.

• Incorrect fuel pressure.

• Engine coolant temperature sensor failed.

• Intake air temperature sensor failed.

• Barometric pressure sensor failed.

• Exhaust leak.

• Use of incorrect or contaminated fuel.

• Harness damage in injector circuit.

• Connector damage.

• Intake system vacuum leaks.

• PCM failed.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-375

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check for exhaust leaks.
Q: Are there any abnormalities?

YES : Go to Step 2.
NO : Repair it. Then go to Step 16.

STEP 2. Check for intake system vacuum leaks.
Q: Are there any abnormalities?

YES : Go to Step 3.
NO : Repair it. Then go to Step 16.

STEP 3. Using scan tool MB991958, check data list item 12:
Volume Airflow Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

12, Volume Airflow Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C

to 95

°C (176°F to 203°F).

• When idling, between 18 and 44 Hz (between 3.7 and

7.6 gm/s).

• When 2,500 r/min, between 58 and 98 Hz (between

11.9 and 17.9 gm/s).

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 4.
NO : Refer to, DTC P0101

− Volume Airflow Circuit

Range/Performance Problem

P.13A-33

, DTC P0102

− Volume Airflow Circuit Low Input

P.13A-42

.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-376

STEP 4. Using scan tool MB991958, check data list item 13:
Intake Air Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item

13, Intake Air Temperature Sensor.

• The intake air temperature and temperature shown with

the scan tool should approximately match.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 5.
NO : Refer to, DTC P0111

− Intake Air Temperature Circuit

Range/Performance Problem

P.13A-89

, DTC P0112

− Intake Air Temperature Circuit Low Input

P.13A-97

,

DTC P0113

− Intake Air Temperature Circuit High

Input

P.13A-103

.

STEP 5. Using scan tool MB991958, check data list item 21:
Engine Coolant Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item

21, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature

shown with the scan tool should approximately match.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 6.
NO : Refer to, DTC P0116

− Engine Coolant Temperature

Circuit Range/Performance Problem

P.13A-111

, DTC

P0117

− Engine Coolant Temperature Circuit Low

Input

P.13A-122

, DTC P0118

− Engine Coolant

Temperature Circuit High Input

P.13A-128

.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK303629AB

MB991911

MB991827

MB991824

16-PIN